Horses evolved in North America, but ironically all North American species perished at the end of the last ice age. The horses today are modern Eurasian descendants of ancient North American breeds. (Source: University of Texas)

Modern horses have long teeth and complex cusps, well adapted for chewing high-silica grass. (Source: Google Images)

Dietary changes take as much as a million years to broadly select a particular population, say researchers

Evolution
says that the genetic material of the fittest species will typically survive
and displace that of less fit species. But there's much debate over finer
details, such as how fast this process happens.

Paleodental researchers at the New York College of Osteopathic Medicine have
completed an important new study [press
release] that examines how fast the process of evolution operates in
response to changes in available diet. The study looks at a relatively
vast array of fossilized horse teeth and fossilized plant materials that date
back as far as 55 million years ago.

Their conclusion is that the old adage "you are what you eat" holds
true -- if you give it about a million years.

NYCOM anatomy professor Matthew Mihlbachler [profile] said the key to the
exciting study was in developing an effective method to tell what the horses
were eating. Past studies looked at the teeth on a microscopic scale or
performed chemical tests to try to extract clues on the creatures' diet.
Such methods were laboriously slow.

But Professor Mihlbachler used a new approach called mesowear. This
approach examines the shape of the tooth, particularly the sharpness of the
cusps of molars. The method is remarkably accurate as tooth shape is
directly targeted to a specific animal's diet.

The result was a very comprehensive work. Describes Professor Mihlbachler
in an LiveScience, "We looked at wear patterns on horse teeth
using mesowear through the entire history, from 55 million years ago in North
America to the extinction at the end of the last ice age."

The horses of 55 million years ago would hardly be recognizable by today's
standards. No bigger than a modern fox, these petite creatures roamed
warm, moist forests of North America munching on fruits and berries. The
creatures had four toes and their teeth were rounded to properly deal with
their soft food.

Around 33 million years ago, the climate began to change and leafy shrubs suitable
for the cooler weather displaced the fruity plants. The process of
evolution by natural selection transformed the horses into slightly larger leaf
eaters. The horses’ teeth became sharper in order deal with the new diet.

Describes Mr. Mihlbachler, "The signal we are getting in the change in
horses' diet is very consistent with what we understand about how the climate
was changing."

Horses underwent a final evolutionary metamorphosis approximately 18 million
years ago as grasslands displaced the cool forests. Grasses have high
silica content, so horses had to develop longer teeth with more complex
surfaces to deal with the new diet. While leaf-eaters (with sharp teeth)
persisted for several million years, they were eventually displaced entirely by
the grass eaters. In the mean time the grass eating horses' teeth
continue to get longer with passing generations.

By 4 or 5 million years ago, the horses were completely adapted to grass lands.
And it paid off. Horses expanded across most of North America and
expanded across the Eurasian land mass. There, early humans would
encounter them and domesticate them, an encounter that would play a key role in
human society.

Before that would happen in full, the pioneer North American breeds would die
off, due to the last Ice Age abruptly ending, around 10,000 years ago.
But North America would yet again see horses, when the domesticated
Eurasian descendants were reintroduced into the "New World".

The most intriguing thing about the study was not only that the dental record
closely followed the change in foliage. The more interesting thing was
that it lagged slightly behind the changes, with the horses taking up to a
million years to fully adjust to foliage changes.

This offers interesting evidence into the timescales of major evolutionary
adaptation. And it is relatively consistent with past evolutionary
theory. States Professor Mihlbachler, "The changes in the teeth are
just slightly behind the environment and dietary trends, which is very
consistent with the hypothesis of adaptation. Certainly, there were leaves and
trees throughout all that time period, from 55 million years ago to the
extinction. What we don’t know is why horses left those niches."

No scientist would claim that evolution happens the same way every time.
Thus it is important to practice caution when applying these time frames
to other species or adaptive events. But they do offer excellent evidence
in support of key evolutionary hypotheses.

Thomas Scandalis, dean of NYCOM concludes, "You are what you eat,’ we hear
this all the time, but now we know it is true."

The paper on the work was published [abstract]
in one of academia's most prestigious journals, Science.

If you're hungry for more evolutionary anatomical research, dig into NYCOM's
February study [press release] [abstract]
which examined a "bizarre" "pudgy" crocodile that lived in
Madagascar, right before the mass extinction of the dinosaurs. If you
expected a vicious dinocroc like you might spot in a Sci-Fi channel
movie special, you will be disappointed -- NYCOM Professor Robert Hill [profile] says the beast was a
"gentle, vegetarian crocodile."

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